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knot board said..
I'd like to start drawing up a house, shed, studio and pool design to fit an odd shaped block. Ideally I'll also like to be able to model solar radiation for the given location. Happy to pay for a good a package if anyone has recommendations?
I won't be doing structural design, I just want to layout everything to maximise views and make efficient use of the available space.
It sounds like what you want to achieve is space planning rather than detail design and while I have never used it I would say Sketchup would be the way to go. Keep things simple at first with your designs and just use simple geometric shapes and do lots of different concepts. Do as many simple concepts as you can and do the silly designs that you think wont work you will be amazed at how a design can be developed from out of the box thinking. Then walk away from the designs for a few days to clear them from your head and remove any bias thinking you have built up in them. Think draw and think, constantly consider new layouts types of designs and shapes and eventually the design will slowly start to feel good and tick all the boxes and when that happens you will know that this design is the best outcome because you have put in the effort to prove it.
I have been designing for close to 40 years from the drawing board through to high end CAD systems and I will say the most important part of the process is in the concept design stage. At no point can you save more money that playing with the design, the decision at this point can save you the most money and give the best outcome. The further you move through the project the less saving can be made and the more chance costs can escalate.
I still concept design in 2D rather than 3D as its simple and quick almost like sketching freehand so don't get caught up in the need to try 3D.
Good luck with it.